| 摘要 |
PROBLEM TO BE SOLVED: To efficiently convert incident external light to unidirectional polarized light instead of a polarizing plate causing the loss of incident light quantity by converting the light having a second polarization direction to the light having a polarization direction almost coinciding with a first polarization direction. SOLUTION: The incident external light is passed through the lens part 11 and the light guiding part 13 of a condensing body 1 and mainly condensed at a condensing part 12. Besides, it arrives at a polarized light separation part 2a. Then, the X polarized light out of the incident external light is transmitted through a reflecting polarizer 4 and emitted downward. On the other hand, the Y polarized light is regularly reflected by the reflecting polarizer 4a and advanced in a right direction. Besides, it is regularly reflected again by the reflecting polarizer 4b being adjacent on the right and advanced downward. Then, it arrives at a double refraction plate 5a. Since the plate 5a is provided with the function of a λ/2 plate, the Y polarized light is converted to the X polarized light and emitted to the downside of a polarized light conversion body 50. Besides, since the laminating surface of the polarizers 4a and 4b and a transparent plate 3 are arranged to be inclined with respect to the upper and the lower surfaces of the separation part 2a, the Y polarized light is converted to the X polarized light and efficiently emitted in a lower direction from the lower surface of the conversion body 50 thereafter. |
